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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0422c8c9c55e45470717d3ce93b08db623eb6adcef63f6b91b45cb02b1d2ae1f' 
  AND token = 'tjb92Rb8UR18IyfCxcAHkfd7gUMJHlMJ1E0SrWvysx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}